IBM OmniFind from Yahoo "indexes up to 500,000 documents and over 200 file types in 30 different languages". It's a software available for Linux and Windows, that can be downloaded for free. System requirements are pretty rough: 2 processors at 3 GHz, 2 GB of RAM, 250 GB free space.
On the other hand, Google Search Appliance is an integrated hardware/software solution that uses Red Hat Linux, 2 dual-core Intel Xeon processors and 16GB of RAM (GB-1001).
Unlike Omnifind, Google's solution looks at the connection between documents and tries to do for intranet what Google does for Internet: ranking search results by
Yahoo's entry in enterprise search market shows that Yahoo continues to outsource search, but it choose excellent products for that.